I met him online, can I ask him out first?

This guy added me on FB, we are chatting since Wednesday, I have never met him, but we have few friends in common. I really enjoy chatting with him, but wondering why is he not asking me out during this weekend.

Can I propose to meet in real life or should I wait for him to suggest this?

He is taking care of his fathers dog while his father is on holiday, so I was thinking that I will propose that I can help him to walk his dog, but I don´t want to make an impression that I´m desperate for a date.